A mapping f:X→Y
between continua X
and Y
is said to be atomic at a
subcontinuumK
of the domain X
provided that f(K) is nondegenerate and K=f−1(f(K)). The set
of subcontinua at which a given mapping is atomic, considered as a subspace of the hyperspace of all
subcontinua of X, is studied. The introduced concept is applied to get new characterizations of atomic
and monotone mappings. Some related questions are asked.